When Faatimah (daughter of the prophet Muhammad (pbuh)), asked her father, for a servant, she complained to him regarding what she suffers from in terms of actions of the household. He said to her and her husband.
“Shall I not tell you of something better for you than a servant? If you go to your bed, say Subhaana Allaah thirty-three times, Al-Hamdu Lillaah thirty three times, and Allaahu Akbar thirty three times, because that is better for you than a servant.” (Reported by Al-Bukhaari and Muslim)
Ibn Al-Qayyim, may Allaah have mercy on him, said:
"The Prophet (pbuh), taught his daughter Faatimah and `Ali to say Subhaan Allaah thirty-three times, AlHamduLillaah thirty three times, and Allaahu thirty three times, when she asked him for a servant and complained to him regarding the difficulties of grinding, walking, and serving. So, he taught them both those supplications, and said: ‘that is better for you than a servant,’ so, it was said that whoever is constant in doing that, they would find strength in their day that would make them self-sufficient, not needing a servant.”{ Al-Waabil As-Sayyib (pg. 77).}